Stabilization of tetraalkyl lead and compositions containing the same



Patented Aug. 13, 1929.

UNITED STATES PATENT OFFICE.

WILLIAM S. CALCOTT. OF PENNS GROVE, AND ALFRED E. PARMELEE, F CARNEYS POINT, NEW JERSEY, ASSIGNORS TO E.

WILMINGTON, DELAWARE,

I. DU PONT DE NEMOURS 8: COMPANY, OF

A CORPORATION OF DELAWARE.

STABILIZATION OF TETRAALKYL LEAD AND COMPOSITIONS CONTAINING THE SAME.

No Drawing. Application filed June 19,

This invention relates to the stabilization of tetra alkyl lead, unmixed with anything but its normal impurities, and to the stabilization of tetra alkyl lead compositions containing hydrocarbons and halogen derivatives of hydrocarbons. More particularly our invention relates to the stabilization of tetra alkyl lead and compositions containing tetra alkyl lead by the addition thereto of 10 small amounts of aliphatic amines or derlvatives of aliphatic amines.

It is known that ordinarily commercial tetra alkyl lead, particularly tetra ethyl lead, decomposes slowly on standing, with the formation of a precipitate, and that this decomposition is accelerated in these compounds when they contain such organic sub stances as halogen derivatives of hydrocarbons.

An object of our invention is the stabilization of tetra alkyl lead compounds and compositions containing these compounds. Other objects will appear as the descrlptlon proceeds.

\Ve have discovered that decomposition of tetra alkyl lead compounds, and compositions containing the same, can be prevented by the introduction into these compounds or compositions, of aliphatic primary, secondary, or tertiary amines, or derivatives of these, such as the tetra alkyl ammonium hydroxides, and alkyl substituted hydroxyl amines.

B way of description of our invention, the ollowing illustrative examples are given, but it will be understood that other embodiments exist and may be practiced without departing from the spirit of the invention:

Example 1.--5O grams of tetra ethyl lead, 45 grams of ethylene dibromide, and 5 grams of mono-chlor-naphthalene are mixed together. To this mixture is added diethylamine, either anhydrous or as water solution, in amounts up to one gram.

Example 2.50 grams of tetra ethyl lead, 45 grams of ethylene dibromide, and 5 grams of mono-chlor-naphthalene are mixed to gether. To this mixture is addedmono-methlyamine, either anhydrous or as water solution, in amounts up to one gram.

Example 3.-50 grams of tetra methyl lead, 45 grams of ethylene dibromide, and 5 grams of mono-ehlor-naphthalene are mixed 1928. Serial No. 286,706.

together. To this mixture is added methylhydroxylamine, either anhydrous or as water solution, in amounts upto one gram.

Example 4.5O grams of tetra ethyl lead, 45 grams of ethylene dibromide, and 5 grams of mono-chlor-naphthalene are mixed together. To this mixture is added tetraethyl-ammonium hydroxide, either anhydrous or as water solution, in amounts up to one gram.

Example 5.5O grams of tetra ethyl lead, 45 grams of ethylene dibromide, and 5 grams of mono-chlor-naphthalene are mixed together. To this mixture is added triethylamine, either anhydrous or as Water solution, in amounts up to one gram.

The solutions prepared according to the foregoing illustrative examples will remain stable indefinitely under the conditions ordinarily employed for the storage of tetra ethyl lead and mixtures containing the same.

It will be understood, of course, that either tetra ethyl lead or tetra methyl lead may be included in any one of the foregoing illustrative examples. \Ve have found that these, solutions so prepared will remain stable indefinitely under the conditions ordinarily employed for the storage of tetra alkyl lead compounds and the compositions containing these compounds.

As many apparently widely different embodiments of this invention may be made without departing from the spirit thereof, it is to be understood that we .do not intend to limit ourselves to the specific embodiments thereof except as indicated in the appended claims.

We claim:

1. A composition comprising tetra alkyl lead and an aliphatic base.

2. A composition comprising tetra alkyl lead and an alky l amine.

3. A composition comprising tetra alkyl lead and dimethylamine.

4. A composition comprising tetra alkyl llOead, an alkyl bromide, and an aliphatic ase.

5. A composition comprising tetra alkyl lead, ethylene dibromide, a chlorinated aromatic hydrocarbon, and an aliphatic base.

6. A composition comprising tetra alkyl lead, ethylene dibromide, a chlor-naphtha- 105 lene, and an aliphatic base.

7. A composition comprising lead, ethylene dibromide, monothale-ne, and an aliphatic base.

/ 8. A composition comprising 5 lead and an aliphatic base.

9. A composition comprising lead and an alkyl amine.

10. A composition comprising lead and dimethylaminc.

11. A composition comprising lead,.an alkyl bromide, and a base.

12. A composition comprising tetra alkyl chlor-naphtetra ethyl tetra ethyl tetra ethyl tetra ethyl n aliphatic tetra ethyl lead, ethylene dibromide, a chlorinated aro- 15 matic hydrocarbon, and an aliphatic base.

13. A. composition comprising lead, ethylene dibromide, lenc, and an aliphatic base. i 14. A composition comprising lead, ethylene dibromide, monothalene, and an aliphatic base.

tetra ethyl a chlor-naphthatetra ethyl chlor-naph- 15. A composition comprising tetra ethyl lead, an alkyl bromide, and an alkylami'nc.

16. A composition comprising tetra ethyl lead, ethylene dibromide, a chlorinated aromatic hydrocarbon, and an alkylamine.

17. A composition comprising tetra ethyl lead, ethylene dibromidc, a chlorinated aromatic hydrocarbon and dimethylamine.

18. A composition comprising tetra ethyl lead, ethylene dibromide, a chlor-naphthalene, and dimethylamine.

19. A composition comprising tetra eth 1 lead, ethylene dibror'nide, mono-chlor-nap 1- thalene, and dimethylamine.

20. A composition comprising tetra alkyl lead, halogen derivatives of hydrocarbons, and an aliphatic amine.

In testimony whereof we atiix our signatures.

WILLIAM S. CALCOTT. ALFRED E. PARMELEE. 

